#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int n = 0;
    int h = 0;
    int m = 0;
    scanf("%d %d %d", &n, &h, &m);
    printf("%d\n", n - m / h - (m % h == 0 ? 0 : 1));
    return 0;
}